Lanair MX300 - Manual (Page 21)

Section 6 - Fuel Supply Pump/Piping
18
Bottom View of the Aluminum Oil
By-Pass Regulator
Figure 4
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When using a by-pass regulator install the fuel supply line from the fuel by-pass regulator
(port B) to the inlet port on the left side of the burner using 1/2” inside diameter (.493)
steel pipe, or 1/2” outside diameter copper tubing. The maximum distance of this line is 25
feet. The fuel supply line must be run below the burner at all times. If the fuel supply line
runs above the burner it will create head pressure. This head pressure will over-fire the
burner voiding the warranty.
When using the optional metering pump install the fuel supply line from the pump
assembly to the burner (see diagram on page 10b).
Install a union in the supply line close to the burner for service.
install a shut-off valve in the fuel supply line for service.
If using copper line on the suction side of the pump use 37º flare fittings on all copper
tubing connections. Do not use compression fittings.
Keep the fuel supply lines 1” off any outside walls.
The fuel supply line must gradually rise to the burner. It should not be higher than
the burner.
Clean all lines, fittings, and parts internally before assembly. A small burr or piece of
rust could plug the nozzle. See Section 2 for an illustration of a typical pump and piping
installation.
When using the optional metering pump skip to Section 7
B.
T.
P.
Port to the oil inlet on the burner assembly.
Install 1/2” O.D. min. copper tubing, or 1/2”
schedule 40 pipe. Failure to install this line
properly will result in damage to your heater,
and will void your warranty.
Port to the oil supply tank for the overflow
return line. Install 1/2” O.D. min. copper
tubing. or1/2“ schedule 40 pipe. This line
MUST run straight into the tank, and
should not be sub-merged in oil. No
elbows should be used. Failure to install
this line properly will result in damage to
your heater, and will void your warranty.
Port from the outlet side of your fuel supply
pump. Install 1/2” O.D. min. copper tubing, or
1/2 schedule 40 pipe. Failure to install this
line properly will result in damage to your
heater, and will void your warranty.